00345nam a2200109Ia 4500008004100000082002500041100002100066245005400087260004200141300001600183490003600199251030b        |||||||| |||| 00| 0 eng d  a519.5024551bB971.SM  aBurridge, Robert  aSome mathematical topics in seismology 1974-75b/  aNew York:bNew York University,c1976  aviii, 317p.  aCourant Institute lecture notes